Reenforced building paper



g 9, 1932- H. A. ANDERSON 1,870,215

REENFORCED BUILDIN Filed NOV. 26, 1930 ATTORNEY Patented Au 9, 1932'UNITED STATES PATENT OFFICE HERBERT A. ANDERSON, OI CHICAGO, ILLINOIS,ASSIGNOR TO AMERICAN BEENI'ORCED PAPER COMPANY, OF ATTLEBORO, MAS

cnusnrrs 7 BEENFOBCED BUILDING PAPER.

Application filed November 26, 1936. Serial No. 498,267.

This invention relates to a novel form of reenforc'ed paper adapted foruse as a building or wrapping paper and for other purposes.

Two types of reenforced paper are now on the market; in one of thesetypes the paper is reenforced by such materials as wlre or unspun fibresof long staple that are no more elastic than the paper itself, andalthough these reenforcing elements are stronger than the paper, bothgive way or rupture simultaneously when subjected to a breaking strain;in the second type the paper is reeniorced by spun strands of cotton,linen, jute, etc. or by a woven fabric formed of spun fibres, andalthough such reenforcing materials are stronger than the paper, theyare moreelastic due to the twists in the reentorcing yarn or twine, andas a result these twisted reenforcing elements will stretch undertension and permit the paper to rupture,

The present invention is directed to a third and new type or" reeniorced paper which is capable of stretching to a substantial degreewithout rupturing, and is formed by adhesively securing reenforcingelements in a straightened condition between sheets of paper that havepreviously been craped, crimped or crinkled, so that the paper maystretch under tension without rupturing. As a result of this newconstruction an elastic or stretchable reenforced paper is producedwhich is well adapted for various uses where this elastic condition isdesirable to prevent the paper from rupturing.

The reenforcing material may be either spun or unspun fibres or areenforcing sheet which is not readily ruptured, and very good resultsare secured through the employment or unspun fibres of long staple asthe reenforcin elements. The reeniorcing material is pre erably securedbetween the sheets of paper by a waterproof adhesive such as tar orblack asphaltum to render the paper moisture-proof,

stretchable, reenforced, waterproof paper constructed in accordance withthe present invention may be subjected to a strain that is suflicient tobreaksome of the reenforcing fibres without necessarily causing the'craped or crinkled paper to rupture or lose its water-proof quality.

While the elastic reenforced paper of the present invention constitutesa cheap waterproof covering that may be well emplo ed as a wrapper forbales, bundles and pac ages, and in the construction of bags, whereadditional strength over ordinary paper and a certain amount of give isrequired to prevent the paper from rupturing, it is articularly welladapted for use as a bui which will not rupture or pull loose from itssecuring means under the contraction and expansion of the paper, due toweather changes.

In employing building paper heretofore, in building constructions, muchdiiiiculty has been experienced when the paper is exposed to theweather, due to the tendency of the paper to shrink under the action ofthe sun and rain, and pull loosefrom the nails or other means employedto fasten the paper in place. This shrinking action of the paper isparticularly noticeable when a multiply building paperis used having awaterproof coating between the sheets of paper, since while the innersheet dry by the coating material, it is acted upon by the repeatedshrinking pull of the outer sheet of paper, without expanding with theouter sheet to relieve its tension.

These difficulties are overcome employment of the reeniorced paper ofthe present invention, as a building paper since the face of themultiply paper exposed to the weather may contract and expand freelywithout rupturing or imparting its shrinking action to the underlyingreenforcing material or inner sheet of paper. In this manner thetendency of building paper to shrink and pull loose from its securingmeans under the action of the weather is entirely overcome.

The above and other features of the invention will be further understoodfrom the following description when read in connection with theaccompanying drawing, wherein Fi 1 is a perspect1ve view of a piece ofmultiply reenforced paper constructed in accordance with the presentinvention, the

through the SACH'USETTS, A CORPORATION 01 MASSA- i ding paper I of papermay be kept sheets of paper bein partly rolled back to show thereenforcing bres;

Fig. 2 is a perspective view showing the paper of 1 as secured to asupporting structure in icated in dotted lines; and

Fig. 3 is a sectional view of a modified form of the reenforcedstretchable paper of the present invention.

In the embodiment-ofthe invention illustrated in Figs. 1 and 2 of thedrawing, the multiply reenforced pa er consists of the two sheets ofpaper 10 an; 11, each of which is crimped, crinkled or given a crapeconstruction throughout its area as shown. This is done to render thepaper elastic or capable of stretching. In many cases the paper need becrimped or crinkled in only one direction to render it sufficientlyelastic to secure the desired results, since if the crinkles or creasesextend transversely of the aper, as shown in the drawing, the aper wille rendered elastic to a substantial egree in the direction of its lengthand will also be rendered elastic transversely to a slight degree. Thepaper, however, may be provided with crinkles or creases extending bothlongitudinally and transversely when it is desired to secure a pa orthat is capable of stretching to a substantial degree bothlongitudinally and transversely.

While, as above stated, various reenforcin materials may be used betweenthe sheets paper and 11 to impart the desired strength to the compositepaper, excellent results are secured through the employment ofrelatively lon unipun fibres, such as sisal. The paper is t ere oreshown as reenforced by one set of straightened unspun fibres 12extending longitu inally of the paper and another set'o straightenedunspun fibres 13 extending transversely of the paper. It is not alwaysessential however, to reenforce the paper both lon 'tudinaly andtransversely.

he adhesive employed should serve to firml secure the reenforcing fibresand the two s eets of aper together so that the fibres will materia yincrease the stren h of the pgper and while the adhesive emp oyed maynon-waterproof, a waterproof adhesive such as black asphaltum is usuallydesirable to prevent the moisture that reaches one sheet of paper frompenetrating through to the second sheet of paper or from decreasing thegrippiii7glpction of the adhesive.

en multiply building pa r having the constructionemployed hereto ore issecured to a building in an unprotected condition, it is found that themultiply paper tends to shrink repeatedly as its outer face becomes wetfrom time to time (due to rain or dampness) and dries out, and that thisshrinking action causes the marginal portions of the building paper topull loose from the nails or other means for holding it in place uponthe building. v

By constructing multiply paper in accordance with the present invention,so that the outer sheet of paper which is exposed to the weather iscrimped or crinkled vthis outer sheet may contract and expand freelywithout rupturing or imparting its contracting action to the underl ingreenforcinfi material. It will there ore be seen t at the stretchablereenforced paper of the present invention forms an excellent buildingpaper and that when the same is secured by nails or the like 14 to aportion of a building such as the boards 15 supported by beams 16, theoverall dimension of the building paper will not be reduced by thecontracting action of the outer or exposed sheet thereof, and as aresult the paper will be permanently held. in place by the securin means14 and will not pull loose as hereto ore.

When the paper of the present invention is to be used as a buildingpaper, it may be suflicient to crape or crimp only the outer or exposedsheet of paper, since the inner sheet of paper which is not exposed tothe rain and sun is not likely to'shrink sufiiciently to cause themultiply sheet of building paper to pull loose from its securing means,

at if only one face of the reenforced paper is crim ed care should beexercised to see that this and not the smooth uncrim ed face of thepaper is exposed to the weat er.

The construction shown in Fig. 3 differs from the construction of Figs.1 and 2 in that while the upper sheet 10 of the construction of Fig. 3is craped or crim ed, the lower sheet 17 is a smooth straight sheet ofpaper. The 1 reenforcing fibres 12 and 13 of Fig. 3 may be the same asin Figs. 1 and 2.

It will be understood from the foregoing that the crinkles in a crapedor crimped sheet of paper, not only render it elastic so that 1 it maystretch without tearing, but also decrease the gripping action of theadhesive u on the sheet of paper at the'raised ortion o the crinkles, tothereb facilitate t e contraction and expansion 0 this sheet of paperunder different weather conditions relative to the reenforcing fibres.

The stretchable reenforced paper of the present invention thereforeforms an excellent building paper that will stay in place 1" upon exsure to the weather over along period 0 time, and is also well adaptedfor use as a wrapping paper and for other purposes where a strong andstretchable waterproof material is desired.

What is claimed is 1. As an improved article of manufacture, amulti-ply, waterproof, building paper which will not shrink appreciablywhen exposed in a stretched condition to varying weather conditions,comprising a composite fabric formed of two sheets of paper craped orcrimped to render them elastic or capable of stretching, and providedwith unspun reenforcing fibres secured by a waterproof adhesive in astraightened condition between the sheets so that the fibres extend bothlongitudinally and transversely of the sheets and arranged so that thecraped or crimped sheet exposed to the weather may contract and expandfreely under the action of the weather while the reenforcing fibresmaintain the overall dimension of the composite fabric substantiallyconstant.

2. As an improved article of manufacture, a multi-ply, waterproofbuilding paper which will not shrink appreciably when exposed in astretched condition to varying weather conditions, comprising acomposite fabric formed of two sheets of paper craped or crimped torender them elastic or capable of stretching, and provided with unspunreenforcing fibres secured by a waterproof adhesive in a straightenedcondition between the sheets so that the craped or crimped sheet exposedto the weather may contract and expand freely under the action of theWeather while the reenforcing fibres maintain the overall dimension ofthe composite fabric substantially constant.

3. As an improved article of manufacture, a multi-ply, waterproofbuilding paper which will not shrink appreciably when exposed in astretched condition to varying weather conditions, comprising acomposite fabric formed of two sheets of paper one of which is craped orcrimped to render it elastic or capable of stretching, and provided withreenforcing strands secured by a waterproof adhesive in a straightenedcondition between the sheets of paper so that the craped or crimpedsheet when exposed to the weather may contract and expand freely underthe action of the weather while the reenforcing strands maintain theoverall dimension of the composite fabric substantially constant. Intestimony whereof, I have signed my name to this specification.

HERlgBERT A. ANDERSON.

